DOI: 10.1063/1.461647. Low-energy excitations in amorphous polymers

Low-energy excitations in amorphous polymers

10.1063/1.461647

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

In order to investigate low-energy excitations below 10 meV, inelastic neutron-scattering measurements have been carried out on various organic amorphous polymers at 10 and 50 K and three inorganic glasses at 150 and 295 K. It was found that a broad excitation peak is observed for all amorphous materials in the ω range of 1.5–4.0 meV irrespective of different chemical structures. On the other hand, highly crystalline polyethylene with a degree of crystallinity 0.96 shows no such broad peak, indicating that the low-energy excitation is characteristic of amorphous materials. We have employed an asymmetric double-well potential as a common origin for the low-energy excitation in amorphous materials and analyzed the results of amorphous polyisobutylene to confirm validity of this model and alternatively to determine parameters of the potential. Analysis of the temperature dependence of the inelastic-scattering intensity of the low-energy excitation leads to a concept of phonon-assisted tunneling in the asymmetric double-well potential.

Bibliography

Inoue, K., Kanaya, T., Ikeda, S., Kaji, K., Shibata, K., Misawa, M., & Kiyanagi, Y. (1991). Low-energy excitations in amorphous polymers. The Journal of Chemical Physics, 95(7), 5332â5340.

Authors 7

K. Inoue (first)
T. Kanaya (additional)
S. Ikeda (additional)
K. Kaji (additional)
K. Shibata (additional)
M. Misawa (additional)
Y. Kiyanagi (additional)

References 31 Referenced 75

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{'key': '2024021011504189400_r11', 'first-page': '40', 'volume': '238', 'year': '1984', 'journal-title': 'Nucl. Instrum. Methods Phys. Res. Sect. A'} / Nucl. Instrum. Methods Phys. Res. Sect. A (1984)
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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 8:21 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 8:34 a.m.)
Indexed	4 weeks, 1 day ago (July 30, 2025, 11:18 a.m.)
Issued	33 years, 10 months ago (Oct. 1, 1991)
Published	33 years, 10 months ago (Oct. 1, 1991)
Published Print	33 years, 10 months ago (Oct. 1, 1991)

Funders 0

None

BibTeX

@article{Inoue_1991, title={Low-energy excitations in amorphous polymers}, volume={95}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.461647}, DOI={10.1063/1.461647}, number={7}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Inoue, K. and Kanaya, T. and Ikeda, S. and Kaji, K. and Shibata, K. and Misawa, M. and Kiyanagi, Y.}, year={1991}, month=oct, pages={5332–5340} }

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